:root {
  --bg:      #ffffff;
  --panel:   #f5f8fa;
  --border:  #99bbcc;
  --text:    #333355;
  --sub:     #556688;
  --accent:  #227777;
  --accent2: #115555;
  --danger:  #993333;
  --radius:  3px;
  --font-mono: 'Courier New', Courier, monospace;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Header ── */
header {
  border-bottom: 2px solid var(--border);
  padding: 12px 20px;
  display: flex;
  align-items: baseline;
  gap: 16px;
}
.logo { font-size: 20px; font-weight: bold; color: var(--accent); letter-spacing: 3px; }
.logo em { color: var(--text); font-style: normal; }
.tagline { font-size: 11px; color: var(--sub); letter-spacing: 1px; }

/* ── Layout ── */
.main {
  display: grid;
  grid-template-columns: 290px 1fr;
  flex: 1;
  min-height: 0;
}

/* ── Sidebar ── */
.sidebar {
  border-right: 1px solid var(--border);
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  overflow-y: auto;
  background: var(--panel);
}

/* ── Section ── */
.section { display: flex; flex-direction: column; gap: 8px; }
.section-title {
  font-size: 10px;
  letter-spacing: 2px;
  color: var(--accent);
  font-weight: bold;
  border-bottom: 1px solid var(--border);
  padding-bottom: 4px;
}

/* ── Drop zone ── */
.drop-zone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius);
  padding: 14px 10px;
  text-align: center;
  cursor: pointer;
  position: relative;
  background: var(--bg);
  transition: border-color 0.15s, background 0.15s;
}
.drop-zone:hover, .drop-zone.drag { border-color: var(--accent); background: #eef5f5; }
.drop-zone input { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; }
.drop-icon { font-size: 20px; color: var(--accent); margin-bottom: 4px; }
.drop-label { font-size: 11px; color: var(--sub); }
.drop-name  { font-size: 10px; color: var(--accent); margin-top: 4px; word-break: break-all; min-height: 12px; }

/* ── Select ── */
select {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 5px 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text);
  cursor: pointer;
  outline: none;
}
select:focus { border-color: var(--accent); }

/* ── Sliders ── */
.ctrl-row { display: flex; flex-direction: column; gap: 3px; }
.ctrl-label {
  font-size: 10px; letter-spacing: 1px; color: var(--sub);
  display: flex; justify-content: space-between;
}
.ctrl-label span { color: var(--text); font-weight: bold; min-width: 36px; text-align: right; }

input[type=range] {
  width: 100%; height: 3px;
  -webkit-appearance: none; appearance: none;
  background: linear-gradient(90deg, var(--accent) var(--pct,50%), var(--border) var(--pct,50%));
  border-radius: 0; outline: none; cursor: pointer;
}
input[type=range]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 12px; height: 12px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 50%; cursor: pointer;
  box-shadow: 0 0 0 1px var(--accent);
}
input[type=range]::-moz-range-thumb {
  width: 12px; height: 12px;
  background: var(--accent);
  border: 2px solid var(--bg);
  border-radius: 50%; cursor: pointer;
}

/* ── Checkbox ── */
.check-row {
  display: flex; align-items: center; gap: 6px;
  font-size: 11px; color: var(--sub); cursor: pointer;
}
.check-row input { accent-color: var(--accent); cursor: pointer; }

/* ── Size inputs ── */
.size-row { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; }
.size-field { display: flex; flex-direction: column; gap: 3px; }
.size-field label { font-size: 10px; color: var(--sub); letter-spacing: 1px; }
.size-field input[type=number] {
  width: 100%; background: var(--bg);
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 4px 6px;
  font-family: var(--font-mono); font-size: 12px; color: var(--text); outline: none;
}
.size-field input[type=number]:focus { border-color: var(--accent); }

/* ── Palette grid ── */
.palette-grid { display: grid; grid-template-columns: repeat(8, 1fr); gap: 3px; }
.pal-swatch {
  aspect-ratio: 1;
  border: 1px solid rgba(0,0,0,0.15);
  border-radius: 2px; cursor: pointer; position: relative;
  transition: transform 0.1s;
}
.pal-swatch:hover { transform: scale(1.15); z-index: 1; }
.pal-swatch.off { opacity: 0.25; }
.pal-swatch::after {
  content: '✓'; position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 7px; color: white; text-shadow: 0 0 2px black;
}
.pal-swatch.off::after { display: none; }
.pal-hint { font-size: 10px; color: var(--sub); letter-spacing: 1px; }

/* ── Glyph grid ── */
.glyph-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
  overflow: hidden;
}
.glyph-cell {
  aspect-ratio: 1;
  border: 1px solid var(--border);
  border-radius: 1px;
  cursor: pointer;
  background: #111;
  overflow: hidden;
  position: relative;
  transition: outline 0.1s;
}
.glyph-cell:hover { outline: 2px solid var(--accent); z-index: 1; }
.glyph-cell canvas { display: block; width: 100%; height: 100%; image-rendering: pixelated; }
.glyph-cell.off { opacity: 0.2; }
.glyph-cell.off::after {
  content: ''; position: absolute; inset: 0;
  background: rgba(180,0,0,0.35);
}
.glyph-btn-row { display: flex; gap: 6px; }
.glyph-info { font-size: 10px; color: var(--sub); letter-spacing: 1px; }

/* ── Status line ── */
.status-line {
  font-size: 10px; color: var(--sub); padding: 3px 6px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--radius); letter-spacing: 1px;
}
.status-line.ok  { color: var(--accent); border-color: var(--accent); }
.status-line.err { color: var(--danger); border-color: var(--danger); }

/* ── Buttons ── */
.btn {
  width: 100%; padding: 8px 10px;
  background: var(--accent); color: #fff;
  border: 1px solid var(--accent2); border-radius: var(--radius);
  font-family: var(--font-mono); font-size: 11px; font-weight: bold;
  letter-spacing: 2px; cursor: pointer; transition: background 0.1s;
}
.btn:hover { background: var(--accent2); }
.btn:active { opacity: 0.85; }
.btn:disabled { background: var(--border); border-color: var(--border); color: var(--sub); cursor: not-allowed; }
.btn.stop { background: var(--danger); border-color: #662222; }
.btn.stop:hover { background: #772222; }
.btn.secondary { background: transparent; color: var(--accent); border-color: var(--accent); }
.btn.secondary:hover { background: #eef5f5; }
.btn.sm { padding: 4px 6px; font-size: 10px; letter-spacing: 1px; }

/* ── Progress ── */
.progress-wrap { display: none; flex-direction: column; gap: 4px; }
.progress-wrap.show { display: flex; }
.progress-bar-outer { height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.progress-bar-inner { height: 100%; background: var(--accent); transition: width 0.1s; width: 0%; }
.progress-text { font-size: 10px; color: var(--sub); letter-spacing: 1px; }

.download-scale { display: flex; flex-wrap: wrap; gap: 5px 8px; align-items: center; font-size: 10px; color: var(--sub); letter-spacing: 1px; }
.download-scale > span { width: 100%; color: var(--sub); }
.download-scale label { cursor: pointer; }
.download-scale input { accent-color: var(--accent); vertical-align: middle; }

.quad-toggle { display: flex; flex-wrap: wrap; gap: 5px 10px; align-items: center; font-size: 10px; color: var(--sub); letter-spacing: 1px; }
.quad-toggle label { cursor: pointer; }
.quad-toggle input { accent-color: var(--accent); vertical-align: middle; }

/* ── Canvas area ── */
.canvas-area {
  display: flex; flex-direction: column;
  align-items: center; justify-content: flex-start;
  padding: 20px; gap: 12px; overflow: auto;
  background: var(--bg);
}
.canvas-container {
  background: #111; border: 1px solid var(--border);
  max-width: 100%; overflow: hidden;
}
#outputCanvas { display: block; max-width: 100%; image-rendering: pixelated; }

#placeholder {
  width: 520px; max-width: 100%; height: 220px;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 10px;
}
.placeholder-art { font-size: 13px; color: #00FF00; line-height: 1.25; white-space: pre; }
.placeholder-msg {
  font-size: 11px; color: #00FF00; letter-spacing: 2px;
  animation: blink 1.2s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

/* ── Info bar ── */
.info-bar { display: flex; gap: 12px; flex-wrap: wrap; justify-content: center; }
.info-chip {
  font-size: 10px; color: var(--sub); letter-spacing: 1px;
  padding: 3px 8px; background: var(--panel);
  border: 1px solid var(--border); border-radius: var(--radius);
}
.info-chip strong { color: var(--accent); }
.tweet-btn { width: min(320px, 100%); margin-top: 2px; }

/* ── Error toast ── */
#errorToast {
  display: none; position: fixed; bottom: 16px; right: 16px;
  background: #ffeaea; border: 1px solid var(--danger);
  color: var(--danger); font-size: 11px; letter-spacing: 1px;
  padding: 8px 14px; border-radius: var(--radius);
  max-width: 300px; z-index: 100;
}

hr.divider { border: none; border-top: 1px solid var(--border); }

@media (max-width: 680px) {
  .main { grid-template-columns: 1fr; }
  .sidebar { border-right: none; border-bottom: 1px solid var(--border); }
}